21043111403 has 2 divisors, whose sum is σ = 21043111404. Its totient is φ = 21043111402.

The previous prime is 21043111367. The next prime is 21043111423. The reversal of 21043111403 is 30411134012.

It is an a-pointer prime, because the next prime (21043111423) can be obtained adding 21043111403 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21043111403 - 2¹⁰ = 21043110379 is a prime.

It is not a weakly prime, because it can be changed into another prime (21043111423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10521555701 + 10521555702.

It is an arithmetic number, because the mean of its divisors is an integer number (10521555702).

Almost surely, 2^21043111403 is an apocalyptic number.

21043111403 is a deficient number, since it is larger than the sum of its proper divisors (1).

21043111403 is an equidigital number, since it uses as much as digits as its factorization.

21043111403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21043111403 its reverse (30411134012), we get a palindrome (51454245415).

The spelling of 21043111403 in words is "twenty-one billion, forty-three million, one hundred eleven thousand, four hundred three".